Finitte-Difference Time-Domain Studies on Optical Transmission through Planar Nano-Apertures in a Metal Film

2004 ◽  
Vol 43 (1) ◽  
pp. 407-417 ◽  
Author(s):  
Eric X. Jin ◽  
Xianfan Xu
Keyword(s):  
Time Domain ◽  
Metal Film ◽  
Optical Transmission ◽  
Difference Time

scholarly journals Investigating the Fabrication Imperfections of Plasmonic Nanohole Arrays and Its Effect on the Optical Transmission Spectra

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Amr M. Mahros ◽  
Marwa M. Tharwat
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Optical Transmission ◽  
Fdtd Method ◽  
Extraordinary Optical Transmission ◽  
Gold Films ◽  
Transmission Spectra ◽  
Nanohole Arrays ◽  
Optical Transmission Spectra ◽  
Difference Time

We investigate the extraordinary optical transmission spectra of thin gold films perforated with imperfect nanohole arrays using the finite difference time domain (FDTD) method. Exponential shapes for the nanohole sidewalls are used. To the best of our knowledge, such investigation of transmission spectra of imperfect nanohole arrays has not previously been demonstrated. It was found that the asymmetry between the two openings of the circular nanoholes or bending to their sidewalls strongly modifies both the intensity and resonance positions of the transmission spectra. Furthermore, the results of this study assist in explaining the technicality of extraordinary optical transmission phenomenon and why some experimental results on transmission differ from those expected.

INVESTIGATION OF OPTICAL TRANSMISSION THROUGH A GOLD GRATING WITH SEMICIRCLE BUMPS USING FDTD METHOD

2013 ◽  
Vol 27 (17) ◽  
pp. 1350126 ◽  
Author(s):  
XIN ZHOU ◽  
JIANSHU FANG ◽  
QIANQUAN ZHU ◽  
BIN TANG ◽  
ZHIMIN LIU
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Optical Transmission ◽  
Fdtd Method ◽  
Resonance Field ◽  
Field Distributions ◽  
Fabry Perot ◽  
Electric And Magnetic Field ◽  
Difference Time ◽  
Phase Resonance

The optical transmissions through a gold grating with semicircle bumps were investigated using finite difference time domain (FDTD) method. As the semicircle bumps are set symmetrically in the slits, the resonant peaks for even modes exhibit a redshift, while odd modes exhibit a blueshift compared with the resonant peaks of the smooth slit grating. When the semicircle bumps are set asymmetrically, obvious resonant dips in the transmission spectrum appeared and they can be modulated by shifting the position of bumps in one slit and changing one slit width. Based on the electric and magnetic field distributions, Fabry–Pérot-like resonance, field interference and phase resonance mechanisms have been suggested for the physical origins of these observations.

scholarly journals Time-Domain Studies of General Dispersive Anisotropic Media by the Complex-Conjugate Pole–Residue Pairs Model

2021 ◽  
Vol 11 (9) ◽  
pp. 3844
Author(s):  
Konstantinos P. Prokopidis ◽  
Dimitrios C. Zografopoulos
Keyword(s):  
Time Domain ◽  
Electromagnetic Wave Propagation ◽  
Frequency Dispersion ◽  
Magnetized Plasma ◽  
Dispersive Media ◽  
Complex Conjugate ◽  
Pole Residue ◽  
Permittivity And Permeability ◽  
Arbitrary Frequency ◽  
Difference Time

A novel finite-difference time-domain formulation for the modeling of general anisotropic dispersive media is introduced in this work. The method accounts for fully anisotropic electric or magnetic materials with all elements of the permittivity and permeability tensors being non-zero. In addition, each element shows an arbitrary frequency dispersion described by the complex-conjugate pole–residue pairs model. The efficiency of the technique is demonstrated in benchmark numerical examples involving electromagnetic wave propagation through magnetized plasma, nematic liquid crystals and ferrites.

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